EGR valve

Abstract

The utility model discloses an EGR (Exhaust Gas Recirculation) valve, which comprises a valve body, a valve core, a valve core, a valve core, a valve core and a valve core, the valve rod penetrates through the mounting cavity and extends into the airflow cavity; the valve rod is sleeved with the anti-corrosion lining, and the outer side wall of the anti-corrosion lining is fixedly matched with the inner side wall of the mounting cavity in a sealed mode; the guide part is arranged on the valve rod in a sleeving mode and located on the side, close to the airflow cavity, of the anti-corrosion lining, the guide part is fixedly matched with the mounting cavity in a sealed mode, and the valve rod can be in sliding fit with the anti-corrosion lining and the guide part in the extending direction of the valve rod; the valve plate assembly is located in the airflow cavity and fixedly connected with the valve rod; the valve plate assembly has a first state and a second state in the process of moving along with the valve rod. When the valve plate assembly is in the first state, the air inlet and the air outlet are not communicated through the valve plate assembly. And when the valve plate assembly is in the second state, the air inlet is communicated with the air outlet. According to the EGR valve, the problem that the valve rod is clamped due to rusting of the valve body can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a valve body technical field especially relates to a kind of EGR valves. BACKGROUND

[0002] With the popularization of non-road national four emissions, more and more construction machinery is equipped with Exhaust Gas Recycle (EGR) system. This system introduces part of exhaust gas into the engine intake system, so that exhaust gas participates in combustion, which can effectively reduce nitrogen oxide emissions and improve vehicle emission level.

[0003] EGR valve controls exhaust gas flow by reciprocating up and down on valve rod. The working scene of construction machinery is complex, and external water or liquid water enters the valve body, which can cause the valve body to rust. Rust erosion to the movement gap between valve rod and valve body can cause the movement gap to be filled with rust, so that the motor cannot be driven, at this time, EGR valve cannot respond to the input signal of Electronic Control Unit (ECU), which can cause error, power shortage and affect normal use of customers. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of EGR valve, above-mentioned EGR valve can avoid the problem of valve rod jamming caused by valve body rust.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] An EGR valve, comprising:

[0007] Valve body, comprising installation cavity and airflow cavity, the airflow cavity includes air inlet and air outlet;

[0008] Valve rod, the valve rod passes through the installation cavity and extends into the airflow cavity;

[0009] Corrosion-resistant bushing, the corrosion-resistant bushing is sleeved on the valve rod, and the outer side wall of the corrosion-resistant bushing is fixed and sealed with the inner side wall of the installation cavity;

[0010] Guide part, the guide part is sleeved on the valve rod and located on the side of the corrosion-resistant bushing close to the airflow cavity, the guide part is fixed and sealed with the installation cavity, and the valve rod can be slidably connected with the corrosion-resistant bushing and the guide part along its own extension direction;

[0011] Valve piece assembly, the valve piece assembly is located in the airflow cavity and is fixedly connected with the valve rod;

[0012] The valve piece assembly has a first state and a second state during movement with the valve rod;

[0013] The valve piece assembly is configured to block the communication between the air inlet and the air outlet when the valve piece assembly is in the first state.

[0014] The valve piece assembly is configured to allow the communication between the air inlet and the air outlet when the valve piece assembly is in the second state.

[0015] Optionally, the material of the corrosion-proof bushing is any one of stainless steel, plastic and aluminum alloy.

[0016] Optionally, the mounting cavity comprises a first cavity opening and a second cavity opening, and the second cavity opening is in communication with the air flow cavity.

[0017] The valve rod passes through the first cavity opening and the second cavity opening.

[0018] The outer wall of the corrosion-proof bushing is fixedly and sealingly matched with the inner side wall of the first cavity opening.

[0019] Optionally, the guide part comprises a first guide bushing and a second guide bushing.

[0020] The first guide bushing is located in the mounting cavity and is sleeved on the valve rod, and the outer side wall of the first guide bushing is fixedly and sealingly matched with the inner side wall of the mounting cavity.

[0021] The second guide bushing is sleeved on the valve rod and is located on the side of the first guide bushing away from the corrosion-proof bushing, and one end of the second guide bushing is fixedly and sealingly matched with the second cavity opening of the mounting cavity.

[0022] Optionally, a sealing ring is further included, which is located between the corrosion-proof bushing and the first guide bushing, and the outer side wall of the sealing ring is fixedly and sealingly matched with the inner side wall of the first cavity opening.

[0023] The valve rod passes through the sealing ring, and the valve rod is slidably matched with the inner side wall of the sealing ring.

[0024] Optionally, the material of the sealing ring is rubber.

[0025] Optionally, the second guide bushing is located in the air flow cavity, and the edge of one end of the second guide bushing has a connecting part, and the second guide bushing is fixedly connected with the valve body at the second cavity opening through the connecting part.

[0026] Optionally, a sealing retainer ring is further included, which is located on the side of the connecting part away from the first guide bushing, and the sealing retainer ring is sleeved on the second guide bushing, and the second guide bushing is fixedly connected with the valve body through the sealing retainer ring.

[0027] Optionally, the air flow cavity comprises a first chamber, a second chamber and a third chamber arranged along the extension direction of the valve rod, the first chamber and the second chamber have a first air passage therebetween, and the second chamber and the third chamber have a second air passage therebetween;

[0028] The air inlet is in communication with the second chamber, and the air outlet is in communication with the first chamber and the third chamber;

[0029] The valve rod can pass through the first air passage and the second air passage;

[0030] The valve piece assembly comprises a first valve piece and a second valve piece arranged along the extension direction of the valve rod;

[0031] When the valve piece assembly is in the first state, the first valve piece is in sealing cooperation with the first air passage, and the second valve piece is in sealing cooperation with the second air passage;

[0032] When the valve piece assembly is in the second state, the first chamber and the second chamber are in communication through the first air passage, and the second chamber and the third chamber are in communication through the second air passage.

[0033] Optionally, a dust cover in sealing cooperation with the outer wall of the valve body is further included;

[0034] The corrosion-resistant bushing and the valve rod are covered inside the dust cover at the end in contact with the corrosion-resistant bushing.

[0035] The utility model provides a kind of EGR valve, in the installation cavity of valve body, corrosion-resistant bushing is arranged, valve body is connected with valve rod by sliding fit through corrosion-resistant bushing, when the outside of valve body has water vapor or liquid water, corrosion-resistant bushing cannot be corroded, then the area of corrosion-resistant bushing in contact with valve rod cannot rust, to further can avoid rust erosion to the movement gap between valve rod and corrosion-resistant bushing, can avoid the problem of valve rod jamming due to the rust of valve body. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 For the structure schematic view of a kind of EGR valve provided in the utility model embodiment.

[0037] Figure:

[0038] 1-valve body;11-air inlet;12-air outlet;2-corrosion-resistant bushing;3-guide portion;31-first guide bushing;32-second guide bushing;4-valve rod;5-valve piece assembly;51-first valve piece;52-second valve piece;6-sealing ring;7-sealing baffle;8-dust cover;A-first chamber;B-second chamber;C-third chamber. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the utility model will be apparently and completely described in connection with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the utility model.

[0040] Please refer to Figure 1 The utility model embodiment provides an EGR valve, comprising:

[0041] The valve body 1 comprises a mounting cavity and an airflow cavity, and the airflow cavity comprises an air inlet 11 and an air outlet 12;

[0042] The valve rod 4 extends into the airflow cavity through the mounting cavity;

[0043] The corrosion-resistant bushing 2 is sleeved on the valve rod 4, and the outer side wall of the corrosion-resistant bushing 2 is fixedly and sealingly matched with the inner side wall of the mounting cavity;

[0044] The guide part 3 is sleeved on the valve rod 4 and located on the side of the corrosion-resistant bushing 2 close to the airflow cavity, the guide part 3 is fixedly and sealingly matched with the mounting cavity, and the valve rod 4 can be slidingly matched with the corrosion-resistant bushing 2 and the guide part 3 along the extension direction of the valve rod 4;

[0045] The valve piece assembly 5 is located in the airflow cavity and is fixedly connected with the valve rod 4;

[0046] The valve piece assembly 5 has a first state and a second state during the movement of the valve rod 4;

[0047] When the valve piece assembly 5 is in the first state, the valve piece assembly 5 makes the air inlet 11 not conductive with the air outlet 12;

[0048] When the valve piece assembly 5 is in the second state, the air inlet 11 is conductive with the air outlet 12.

[0049] In the EGR valve provided by the above-mentioned utility model embodiment, the corrosion-resistant bushing 2 is arranged at the mounting cavity of the valve body 1, the valve body 1 is slidingly and matchingly connected with the valve rod 4 through the corrosion-resistant bushing 2, when the outer side of the valve body 1 has water vapor or liquid water, the corrosion-resistant bushing 2 will not be corroded, then the area where the corrosion-resistant bushing 2 contacts with the valve rod 4 will not rust, and further, the problem that the valve rod 4 is stuck due to the rust of the valve body 1 can be avoided.

[0050] Moreover, the corrosion-resistant bushing 2 and the guide part 3 can jointly play a guiding role for the movement of the valve rod 4, and the stability of the reciprocating movement of the valve rod 4 along the extension direction thereof can be effectively ensured.

[0051] Specifically, the material of the anti-corrosion bushing 2 can be stainless steel. The anti-corrosion bushing 2 made of stainless steel has better adaptability to complex environments, such as high-temperature and high-cold environments, and has good waterproof performance.

[0052] Alternatively, the material of the anti-corrosion bushing 2 can also be plastic or aluminum alloy, or other anti-corrosion materials, which are not limited here and are determined according to actual conditions.

[0053] In the embodiment of the utility model, the mounting cavity of the valve body can include a first cavity opening and a second cavity opening, the second cavity opening is in communication with the airflow cavity, the valve stem 4 can pass through the first cavity opening and the second cavity opening, the outer wall of the anti-corrosion bushing 2 is fixed and sealed with the inner side wall of the first cavity opening, the structure is simple, and the connection of the anti-corrosion bushing 2 and the valve body 1 can be realized.

[0054] In the embodiment of the utility model, the above-mentioned guide part 3 can include a first guide bushing 31 and a second guide bushing 32.

[0055] The first guide bushing 31 can be located in the mounting cavity and sleeved on the valve stem 4, and the outer side wall of the first guide bushing 31 is fixed and sealed with the inner side wall of the mounting cavity.

[0056] The second guide bushing 32 is sleeved on the valve stem 4 and located on the side away from the anti-corrosion bushing 2 of the first guide bushing 31, and one end of the second guide bushing 32 is fixed and sealed with the second cavity opening of the mounting cavity.

[0057] The inner side wall of the first guide bushing 31 and the inner side wall of the second guide bushing 32 can be in sliding cooperation with the valve stem 4, the first guide bushing 31 and the second guide bushing 32 can guide the movement of the valve stem 4, and the stability of the valve stem 4 in the reciprocating movement along the extension direction thereof is effectively ensured.

[0058] Specifically, the anti-corrosion bushing 2 can have a first through hole, the first guide bushing 31 can have a second through hole, and the second guide bushing 32 can have a third through hole, the center lines of the first through hole, the second through hole and the third through hole can coincide, and the valve stem 4 can pass through the first through hole, the second through hole and the third through hole, so as to facilitate the movement of the valve stem.

[0059] In the embodiment of the utility model, the above-mentioned EGR valve can further include a sealing ring 6, the sealing ring 6 can be located between the anti-corrosion bushing 2 and the first guide bushing 31, the outer side wall of the sealing ring 6 is fixed and sealed with the inner side wall of the first cavity opening; the valve stem 4 passes through the sealing ring 6, and the inner side wall of the sealing ring 6 is in slidable cooperation with the valve stem 4.

[0060] In order to ensure that the valve rod 4 is slidably connected with the corrosion-proof bushing 2, the first guide bushing 31 and the second guide bushing 32, the valve rod 4 is in clearance fit with the corrosion-proof bushing 2, the first guide bushing 31 and the second guide bushing 32, and the sealing ring 6 is arranged at the first cavity opening of the valve body 1, so that the gas flowing through the airflow cavity is prevented from flowing out of the valve body 1 through the first cavity opening of the valve body 1.

[0061] Specifically, the material of the sealing ring 6 is rubber, which is simple and easy to manufacture.

[0062] In the embodiment of the utility model, the second guide bushing 32 can be located in the airflow cavity, the edge of one end of the second guide bushing 32 has a connecting part, and the second guide bushing 32 is fixedly connected with the valve body 1 at the second cavity opening through the connecting part, so that the second guide bushing 32 is fixedly and sealingly connected with the second cavity opening.

[0063] Specifically, the EGR valve can further include a sealing retainer 7, the sealing retainer 7 is located on the side of the connecting part away from the first guide bushing 31, the sealing retainer 7 is sleeved on the second guide bushing 32, and the second guide bushing 32 is fixed on the valve body 1 through the sealing retainer 7, which is simple in structure and easy to assemble.

[0064] In the EGR valve, the mechanical structure of the valve body 1, the corrosion-proof bushing 2, the sealing ring 6, the first guide bushing 31, the second guide bushing 32 and the sealing retainer 7 is compact, safe and reliable, and can ensure the stability of the EGR valve.

[0065] In the embodiment of the utility model, the airflow cavity can include a first chamber A, a second chamber B and a third chamber C arranged along the extension direction of the valve rod, the first chamber A and the second chamber B have a first air passage, and the second chamber B and the third chamber C have a second air passage; wherein the air inlet 11 can be in communication with the second chamber B, the air outlet 12 can be in communication with the first chamber A and the third chamber C; the valve rod 4 can pass through the first air passage and the second air passage; the valve piece assembly 5 can include a first valve piece 51 and a second valve piece 52 arranged along the extension direction of the valve rod;

[0066] When the valve piece assembly 5 is in the first state, the first valve piece 51 can be sealingly connected with the first air passage, and the second valve piece 52 can be sealingly connected with the second air passage, so that the first chamber A and the second chamber B are not in communication, and the second chamber B and the third chamber C are not in communication, that is, the air inlet 11 and the air outlet 12 are not in communication;

[0067] When the valve piece assembly 5 is in the second state, the first valve piece 51 can be away from the first air passage, and the second valve piece 52 can be away from the second air passage, the first chamber A and the second chamber B are connected through the first air passage, and the second chamber B and the third chamber C are connected through the second air passage.

[0068] In the EGR valve, the first valve plate 51 and the second valve plate 52 are driven to move by the valve rod 4, when the first valve plate 51 is in sealing cooperation with the first air port and the second valve plate 52 is in sealing cooperation with the second air port, the air inlet 11 and the air outlet 12 are not in communication, and the EGR valve is closed; when the first valve plate 51 is driven to move away from the first air port by the valve rod 4 and the second valve plate 52 is driven to move away from the second air port, the air inlet 11 and the air outlet 12 are in communication, and the flow of the air between the air inlet 11 and the air outlet 12 can be controlled according to the displacement of the first valve plate 51 and the second valve plate 52 driven to move by the valve rod 4.

[0069] Specifically, the air inlet 11 and the air outlet 12 can be arranged along a first direction, and the first direction is perpendicular to the extension direction of the valve rod, so that the structure is simple and convenient to manufacture.

[0070] Specifically, the EGR valve can further comprise a driving motor, which is in cooperation with the valve rod 4 and can drive the valve rod 4 to reciprocate on the valve body 1. The driving motor can be connected with the ECU signal.

[0071] The EGR valve can be a normally closed valve, that is, when the EGR valve is not running, the first valve plate 51 is in sealing cooperation with the first air port of the valve body 1, and the second valve plate 52 is in sealing cooperation with the second air port of the valve body 1, so as to form a sealing structure, and the exhaust gas cannot be transmitted from the air inlet 11 to the air outlet 12 and cannot pass through the valve. When the EGR valve is running, the driving motor is controlled to drive the valve rod 4 to drive the first valve plate 51 and the second valve plate 52 to move by the ECU transmission signal, so that the air inlet 11 and the air outlet 12 are in communication, and the flow of the exhaust gas can be controlled by controlling the displacement of the valve rod 4 to move, so as to improve the emission level of the valve.

[0072] In the embodiment of the utility model, the EGR valve can further comprise a dust cover 8 in sealing cooperation with the outer wall of the valve body 1, and the corrosion-resistant bushing 2 and the end of the valve rod 4 in contact with the corrosion-resistant bushing 2 are covered inside the dust cover 8. The dust cover 8 can prevent dust and other foreign matters from entering the cavity of the valve body 1.

[0073] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model belong to the scope of the claims of the utility model and the equivalent technologies thereof, the utility model also intends to include these modifications and variations.

Claims

1. An EGR valve characterized by, The valve body comprises a mounting cavity and an air flow cavity, the air flow cavity comprises an air inlet and an air outlet; The valve stem extends into the air flow cavity through the mounting cavity; The anticorrosion bushing is sleeved on the valve stem, and the outer wall of the anticorrosion bushing is fixedly and sealingly matched with the inner wall of the mounting cavity; The guide part is sleeved on the valve stem and located on the side of the anticorrosion bushing close to the air flow cavity, the guide part is fixedly and sealingly matched with the mounting cavity, and the valve stem is slidingly matched with the anticorrosion bushing and the guide part along the extension direction of the valve stem; The valve piece assembly is located in the air flow cavity and fixedly connected with the valve stem; The valve piece assembly has a first state and a second state during the movement of the valve stem; When the valve piece assembly is in the first state, the valve piece assembly makes the air inlet and the air outlet not conductive; When the valve piece assembly is in the second state, the air inlet and the air outlet are conductive. The material of the anticorrosion bushing is any one of stainless steel, plastic and aluminum alloy.

2. The EGR valve of claim 1, wherein The mounting cavity comprises a first cavity opening and a second cavity opening, and the second cavity opening is communicated with the air flow cavity; 3. The EGR valve of claim 1, wherein The valve stem passes through the first cavity opening and the second cavity opening; The outer wall of the anticorrosion bushing is fixedly and sealingly matched with the inner wall of the first cavity opening. The guide part comprises a first guide bushing and a second guide bushing; 4. The EGR valve of claim 3, wherein The first guide bushing is located in the mounting cavity and sleeved on the valve stem, and the outer wall of the first guide bushing is fixedly and sealingly matched with the inner wall of the mounting cavity; The second guide bushing is sleeved on the valve stem and located on the side of the first guide bushing away from the anticorrosion bushing, and one end of the second guide bushing is fixedly and sealingly matched with the second cavity opening of the mounting cavity. Further comprising a sealing ring located between the anticorrosion bushing and the first guide bushing, and the outer wall of the sealing ring is fixedly and sealingly matched with the inner wall of the first cavity opening; 5. The EGR valve of claim 4, wherein, The valve stem passes through the sealing ring, and the valve stem is slidingly matched with the inner wall of the sealing ring. The material of the sealing ring is rubber.

6. The EGR valve of claim 5, wherein, The second guide bushing is located in the air flow cavity, and the edge of one end of the second guide bushing has a connecting part, and the second guide bushing is fixedly connected with the valve body at the second cavity opening through the connecting part.

7. The EGR valve of claim 4, wherein, Further comprising a sealing retainer ring located on the side of the connecting part away from the first guide bushing, the sealing retainer ring is sleeved on the second guide bushing, and the second guide bushing is fixedly connected with the valve body through the sealing retainer ring.

8. The EGR valve of claim 7, wherein, The air flow cavity comprises a first chamber, a second chamber and a third chamber arranged along the extension direction of the valve stem, the first chamber and the second chamber have a first air passage, and the second chamber and the third chamber have a second air passage; 9. The EGR valve of claim 1, wherein, The air inlet is communicated with the second chamber, and the air outlet is communicated with the first chamber and the third chamber; The valve stem can pass through the first air passage and the second air passage; The valve piece assembly comprises a first valve piece and a second valve piece arranged along the extension direction of the valve stem; ​ when the valve disc assembly is in the first state, the first valve disc sealingly engages the first vent, and the second valve disc sealingly engages the second vent; when the valve disc assembly is in the second state, the first chamber is in communication with the second chamber through the first vent, and the second chamber is in communication with the third chamber through the second vent.

10. The EGR valve according to any one of claims 1 to 9, characterized in that a dust shield sealingly engaging an outer wall of the valve body is also included; the corrosion-resistant bushing and the valve stem, at an end in contact with the corrosion-resistant bushing, are housed inside the dust shield.

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